Power Supply
`Design Guide for Desktop Platform Form Factors
`
`Revision 1.1
`
`March 2007
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`INFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTION WITH INTEL® PRODUCTS. NO LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR
`OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT. EXCEPT AS PROVIDED IN INTEL'S TERMS AND CONDITIONS
`OF SALE FOR SUCH PRODUCTS, INTEL ASSUMES NO LIABILITY WHATSOEVER, AND INTEL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY, RELATING
`TO SALE AND/OR USE OF INTEL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE,
`MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. Intel products are not intended for
`use in medical, life saving, or life sustaining applications.
`Intel may make changes to specifications and product descriptions at any time, without notice.
`Designers must not rely on the absence or characteristics of any features or instructions marked “reserved” or “undefined.” Intel reserves these for
`future definition and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to them.
`This document contains information on products in the design phase of development. Do not finalize a design with this information. Revised information
`will be published when the product is available. Verify with your local sales office that you have the latest datasheet before finalizing a design.
`Contact your local Intel sales office or your distributor to obtain the latest specifications and before placing your product order.
`Hyper-Threading Technology requires a computer system with an Intel® Pentium® 4 processor supporting HT Technology and a Hyper-Threading
`Technology enabled chipset, BIOS and operating system. Performance will vary depending on the specific hardware and software you use. See <http://
`www.intel.com/info/hyperthreading> for more information including details on which processors support HT Technology
`Intel, Celeron, Intel NetBurst, Xeon and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United
`States and other countries.
`*Other names and brands may be claimed as the property of others.
`Copyright © 2007, Intel Corporation.
`*Other names and brands may be claimed as the property of others.
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`Contents
`
`1
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`2
`
`3
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`4
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`3.2
`
`3.3
`
`Introduction ............................................................................................................ 11
`1.1
`Reference Documentation................................................................................... 11
`1.2
`Terminology ..................................................................................................... 12
`Platform Configurations........................................................................................... 15
`2.1
`Digital Home and Digital Office Platform Configurations - RECOMMENDED ................. 15
`Electrical ................................................................................................................. 21
`3.1
`AC Input - REQUIRED ........................................................................................ 21
`3.1.1
`Input Over Current Protection - REQUIRED ................................................ 21
`3.1.2
`Inrush Current - REQUIRED ..................................................................... 21
`3.1.3
`Input Under Voltage - REQUIRED ............................................................. 21
`DC Output - REQUIRED ...................................................................................... 22
`3.2.1 DC Voltage Regulation ............................................................................ 22
`3.2.2 Output Transient Response - REQUIRED .................................................... 22
`3.2.3 Remote Sensing - REQUIRED ................................................................... 23
`3.2.4 Other Low Power System Requirements - RECOMMENDED ........................... 23
`3.2.5 Output Ripple Noise - REQUIRED .............................................................. 23
`3.2.6 Capacitive Load - REQUIRED.................................................................... 24
`3.2.7 Closed Loop Stability - REQUIRED ............................................................ 24
`3.2.8 +5 VDC / +3.3 VDC Power Sequencing - REQUIRED ................................... 24
`3.2.9
`Voltage Hold-up Time - REQUIRED ........................................................... 25
`Timing, Housekeeping and Control - REQUIRED..................................................... 25
`3.3.1
`PWR_OK ............................................................................................... 25
`3.3.2
`Power-up Cross Loading Condition ............................................................ 26
`3.3.3
`PS_ON#................................................................................................ 26
`3.3.4 +5 VSB................................................................................................. 27
`3.3.5
`Power-on Time....................................................................................... 27
`3.3.6 Rise Time .............................................................................................. 27
`3.3.7 Overshoot at Turn-on / Turn-off ............................................................... 28
`Reset after Shutdown ........................................................................................ 28
`3.4.1 +5 VSB at Power-down ........................................................................... 28
`Output Protection - REQUIRED ............................................................................ 28
`3.5.1 Over Voltage Protection........................................................................... 28
`3.5.2
`Short Circuit Protection ........................................................................... 28
`3.5.3 No-load Situation ................................................................................... 29
`3.5.4 Over Current Protection .......................................................................... 29
`3.5.5 Over Temperature Protection ................................................................... 29
`3.5.6 Output Bypass ....................................................................................... 29
`3.5.7
`Separate Current Limit for 12V2 - RECOMMENDED...................................... 29
`3.5.8 Overall Power Supply Efficiency and ENERGY STAR ..................................... 29
`Mechanical .............................................................................................................. 33
`4.1
`Labeling and Marking - RECOMMENDED................................................................ 33
`4.2
`Connectors - REQUIRED ..................................................................................... 33
`4.2.1
`AC Connector ........................................................................................ 33
`4.2.2 DC Connectors ....................................................................................... 33
`4.2.2.1 Main Power Connector ............................................................... 34
`4.2.2.2 Peripheral Connectors................................................................ 35
`4.2.2.3 Floppy Drive Connector.............................................................. 35
`4.2.2.4 +12 V Power Connector ............................................................. 36
`4.2.2.5 Serial ATA* Power Connectors .................................................... 36
`Airflow and Fans - RECOMMENDED ...................................................................... 37
`
`3.4
`
`3.5
`
`4.3
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`Fan Location and Direction .......................................................................37
`4.3.1
`Fan Size and Speed ................................................................................37
`4.3.2
`Venting .................................................................................................38
`4.3.3
`Acoustics .................................................................................................................39
`5.1
`Acoustics - RECOMMENDED.................................................................................39
`Environmental .........................................................................................................41
`6.1
`Temperature - RECOMMENDED............................................................................41
`6.1.1
`Thermal Shock (Shipping)........................................................................41
`Humidity - RECOMMENDED .................................................................................41
`6.2
`Altitude - RECOMMENDED ...................................................................................41
`6.3
`Mechanical Shock - RECOMMENDED .....................................................................41
`6.4
`Random Vibration - RECOMMENDED.....................................................................41
`6.5
`Electromagnetic Compatibility .................................................................................43
`7.1
`Emissions - REQUIRED .......................................................................................43
`7.2
`Immunity - REQUIRED .......................................................................................43
`7.3
`Input Line Current Harmonic Content - OPTIONAL ..................................................43
`7.4
`Magnetic Leakage Fields - REQUIRED ...................................................................44
`7.5
`Voltage Fluctuations and Flicker - REQUIRED .........................................................44
`Safety ......................................................................................................................45
`8.1
`North America - REQUIRED .................................................................................45
`8.2
`International - REQUIRED ...................................................................................45
`8.3
`Proscribed Materials ...........................................................................................46
`8.4
`Catastrophic Failure Protection - REQUIRED ..........................................................46
`Reliability ................................................................................................................47
`9.1
`Reliability - RECOMMENDED ................................................................................47
`CFX12V Specific Guidelines 1.4 ................................................................................49
`10.1 Typical Power Distribution - RECOMMENDED..........................................................49
`10.2 Physical Dimensions - REQUIRED .........................................................................53
`LFX12V Specific Guidelines 1.2 ................................................................................55
`11.1 Typical Power Distribution - RECOMMENDED..........................................................55
`11.2 Physical Dimensions - REQUIRED .........................................................................58
`ATX12V Specific Guidelines 2.3 ................................................................................63
`12.1 Typical Power Distribution - RECOMMENDED..........................................................63
`12.2 Physical Dimensions - REQUIRED .........................................................................72
`SFX12V Specific Guidelines 3.2 ................................................................................75
`13.1 Typical Power Distribution - RECOMMENDED..........................................................75
`13.2 Lower Profile Package - Physical Dimensions - REQUIRED........................................79
`13.3 Fan Requirements - REQUIRED............................................................................79
`13.4 Top Fan Mount Package - Physical Dimensions - REQUIRED .....................................81
`13.5 Fan Requirements - REQUIRED............................................................................81
`13.6 Reduced Depth Top Mount Fan - Physical Dimensions - REQUIRED ...........................83
`13.7 Fan Requirements - REQUIRED............................................................................83
`13.8 Standard SFX Profile Package - Physical Dimensions - REQUIRED .............................84
`13.9 Fan Requirements - REQUIRED............................................................................85
`13.10 PS3 Form Factor- Physical Dimensions - REQUIRED................................................86
`13.11 Fan Requirements - REQUIRED............................................................................86
`TFX12V Specific Guidelines 2.3 ................................................................................89
`14.1 Typical Power Distribution - RECOMMENDED..........................................................89
`14.2 Physical Dimensions - REQUIRED .........................................................................94
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`15
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`14.3 Mounting Options - RECOMMENDED..................................................................... 97
`14.4 Chassis Requirements - RECOMMENDED............................................................... 97
`Flex ATX Specific Guidelines 1.0 .............................................................................. 99
`15.1 Typical Power Distribution - RECOMMENDED ......................................................... 99
`15.2 Physical Dimensions - REQUIRED ...................................................................... 103
`
`Figures
`1
`Differential Noise Test Setup ..................................................................................... 24
`2
`Power Supply Timing ................................................................................................ 25
`3
`PS_ON# Signal Characteristics................................................................................... 27
`4
`PSU Efficiency as Percentage of Output ....................................................................... 30
`5
`PSU Efficiency per Power for 450 W PSU ..................................................................... 31
`6
`PSU Efficiency per Power for 250 W PSU ..................................................................... 31
`7
`Connectors (Pin-side view, not to scale) ...................................................................... 34
`8
`Serial ATA* Power Connector..................................................................................... 36
`9
`Cross Loading Graph for 180 W Configurations............................................................. 49
`10 Cross Loading Graph for 220 W Configurations............................................................. 50
`11 Cross Loading Graph for 270 W Configuration .............................................................. 51
`12 Cross Loading Graph for 300 W Configuration .............................................................. 52
`13 CFX12V Mechanical Outline ....................................................................................... 54
`14 Cross Loading Graph for 180 W Configuration .............................................................. 55
`15 Cross Loading Graph for 220 W Configurations............................................................. 56
`16 Cross Loading Graph for 270 W Configuration .............................................................. 57
`17 Mechanical Outline ................................................................................................... 59
`18 Mechanical Details.................................................................................................... 60
`19 PSU Slot Feature Detail............................................................................................. 60
`20 Recommended Chassis Tab Feature............................................................................ 61
`21 Cross Loading Graph for 180 W Configurations............................................................. 63
`22 Cross Loading Graph for 220 W Configurations............................................................. 64
`23 Cross Loading Graph for 270 W Configurations............................................................. 65
`24 Cross Loading Graph for 300 W Configurations............................................................. 66
`25 Cross Loading Graph for 350 W Configurations............................................................. 67
`26 Cross Loading Graph for 400 W Configurations............................................................. 68
`27 Cross Loading Graph for 450 W Configurations............................................................. 69
`28 Power Supply Dimensions for Chassis that does not Require Top Venting......................... 72
`29 Power Supply Dimensions for Chassis that Require Top Venting...................................... 73
`30 Cross Loading Graph for 180 W Configuration .............................................................. 75
`31 Cross Loading Graph for 220 W Configurations............................................................. 76
`32 Cross Loading Graph for 270 W Configuration .............................................................. 77
`33 Cross Loading Graph for 300 W Configuration .............................................................. 78
`34 40 mm Profile Mechanical Outline............................................................................... 80
`35 Chassis Cutout ........................................................................................................ 80
`36 Top Mount Fan Profile Mechanical Outline .................................................................... 82
`37 Chassis Cutout ........................................................................................................ 83
`38 Recessed Fan Mounting............................................................................................. 83
`39 Reduced Depth Top Mount Fan Profile Mechanical Outline .............................................. 84
`40 Chassis Cutout ........................................................................................................ 84
`41 60 mm Mechanical Outline ........................................................................................ 85
`42 Chassis Cutout ........................................................................................................ 86
`43 PS3 Mechanical Outline ............................................................................................. 87
`44 Cross Loading Graph for 180 W Configuration .............................................................. 89
`45 Cross Loading Graph for 220 W Configurations............................................................. 90
`46 Cross Loading Graph for 270 W Configuration .............................................................. 91
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`47 Cross Loading Graph for 300 W Configuration...............................................................92
`48 Mechanical Outline....................................................................................................94
`49 Dimensions & Recommended Feature Placements (not to scale)......................................95
`50 Power Supply Mounting Slot Detail..............................................................................96
`51 Fan Right and Fan Left Orientations of Power Supply in a Chassis....................................97
`52 Suggested TFX12V Chassis Cutout ..............................................................................97
`53 Suggested Mounting Tab (chassis feature) ...................................................................98
`54 Cross Loading Graph for 180 W Configuration...............................................................99
`55 Cross Loading Graph for 220 W Configurations ........................................................... 100
`56 Cross Loading Graph for 270 W Configuration............................................................. 101
`57 Mechanical Outline.................................................................................................. 103
`58 Dimensions & Recommended Feature Placements (not to scale).................................... 104
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`Tables
`1
`Conventions and Terminology .................................................................................... 12
`2
`Support Terminology ................................................................................................ 13
`3
`Digital Home Platform Configurations for 2007 - Lifestyle EPC Mainstream ....................... 15
`4
`Digital Home Platform Configurations for 2007 - CE EPC ................................................ 15
`5
`Digital Home Platform Configurations for 2007 - Lifestyle EPC Premium........................... 16
`6
`Digital Home Platform Configurations for 2007 - Extreme Gaming and Media ................... 16
`7
`Digital Office Platform Configurations for 2007 - Entry................................................... 17
`8
`Digital Office Platform Configurations for 2007 - Fundamental ........................................ 17
`9
`Digital Office Platform Configurations for 2007 - Professional ......................................... 18
`10 Digital Office Platform Configurations for 2007 - High Performance ................................. 18
`11 Digital Office Platform Configurations for 2006 ............................................................. 19
`12 Digital Home Platform Configurations for 2006 ............................................................. 19
`13 12V2 Current for Processor Configurations................................................................... 19
`14 AC Input Line Requirements ...................................................................................... 21
`15 DC Output Voltage Regulation.................................................................................... 22
`16 DC Output Transient Step Sizes ................................................................................. 22
`17 Recommended 5 VSB Efficiency ................................................................................. 23
`18 DC Output Noise/Ripple ............................................................................................ 23
`19 Output Capacitive Loads ........................................................................................... 24
`20 PWR_OK Signal Timing ............................................................................................. 25
`21 PWR_OK Signal Characteristics .................................................................................. 26
`22 PS_ON# Signal Characteristics................................................................................... 26
`23 Over Voltage Protection ............................................................................................ 28
`24 Efficiency Versus Load .............................................................................................. 29
`25 Power Supply Sizes for ENERGY STAR Desktop System Categories.................................. 32
`26 Main Power Connector Pin-out ................................................................................... 34
`27 Peripheral Connector Pin-out ..................................................................................... 35
`28 Floppy Connector Pin-out .......................................................................................... 35
`29 +12 V Power Connector Pin-out ................................................................................. 36
`30 Serial ATA* Power Connector Pin-out.......................................................................... 36
`31 Recommended Power Supply Acoustic Targets ............................................................. 39
`32 Harmonic Limits, Class D Equipment........................................................................... 43
`33 Typical Power Distribution for 180 W Configurations ..................................................... 49
`34 Typical Power Distribution for 220 W Configurations ..................................................... 50
`35 Typical Power Distribution for 270 W Configurations ..................................................... 51
`36 Typical Power Distribution for 300 W Configurations ..................................................... 52
`37 180 W Loading for Efficiency Measurements ................................................................ 52
`38 220 W Loading for Efficiency Measurements ................................................................ 53
`39 270 W Loading for Efficiency Measurements ................................................................ 53
`40 300 W Loading for Efficiency Measurements ................................................................ 53
`41 Typical Power Distribution for 180 W Configurations ..................................................... 55
`42 Typical Power Distribution for 220 W Configurations ..................................................... 56
`43 Typical Power Distribution for 270 W Configurations ..................................................... 57
`44 180 W Loading for Efficiency Measurements ................................................................ 57
`45 220 W Loading for Efficiency Measurements ................................................................ 58
`46 270 W Loading for Efficiency Measurements ................................................................ 58
`47 Typical Power Distribution for 180 W Configurations ..................................................... 63
`48 Typical Power Distribution for 220 W Configurations ..................................................... 64
`49 Typical Power Distribution for 270 W Configurations ..................................................... 65
`50 Typical Power Distribution for 300 W Configurations ..................................................... 66
`51 Typical Power Distribution for 350 W Configurations ..................................................... 67
`52 Typical Power Distribution for 400 W Configurations ..................................................... 68
`53 Typical Power Distribution for 450 W Configurations ..................................................... 69
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`54 180 W Loading for Efficiency Measurements .................................................................69
`55 220 W Loading for Efficiency Measurements .................................................................70
`56 270 W Loading for Efficiency Measurements .................................................................70
`57 300 W Loading for Efficiency Measurements .................................................................70
`58 350 W Loading for Efficiency Measurements .................................................................70
`59 400 W Loading for Efficiency Measurements .................................................................70
`60 450 W Loading for Efficiency Measurements .................................................................71
`61 Typical Power Distribution for 180 W Configurations ......................................................75
`62 Typical Power Distribution for 220 W Configurations ......................................................76
`63 Typical Power Distribution for 270 W Configurations ......................................................77
`64 Typical Power Distribution for 300 W Configurations ......................................................78
`65 180 W Loading for Efficiency Measurements .................................................................78
`66 220 W Loading for Efficiency Measurements .................................................................79
`67 270 W Loading for Efficiency Measurements .................................................................79
`68 300 W Loading for Efficiency Measurements .................................................................79
`69 Typical Power Distribution for 180 W Configurations ......................................................89
`70 Typical Power Distribution for 220 W Configurations ......................................................90
`71 Typical Power Distribution for 270 W Configurations ......................................................91
`72 Typical Power Distribution for 300 W Configurations ......................................................92
`73 180 W Loading for Efficiency Measurements .................................................................92
`74 220 W Loading for Efficiency Measurements .................................................................93
`75 270 W Loading for Efficiency Measurements .................................................................93
`76 300 W Loading for Efficiency Measurements .................................................................93
`77 Typical Power Distribution for 180 W Configurations ......................................................99
`78 Typical Power Distribution for 220 W Configurations .................................................... 100
`79 Typical Power Distribution for 270 W Configurations .................................................... 101
`80 180 W Loading for Efficiency Measurements ............................................................... 101
`81 220 W Loading for Efficiency Measurements ............................................................... 102
`82 270 W Loading for Efficiency Measurements ............................................................... 102
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`Contents
`
`Revision
`
`Description
`
`Date
`
`• Initial release of combined power supply design guide
`• Combined CFX12V, LFX12V, ATX12V, SFX12V, and TFX12V content into one desktop
`power supply design guide
`• CFX12V content derived from revision 1.2
`— - Updated 12V1 current for 300 W configuration
`— - Updated efficiency loading for 300 W configuration
`• LFX12V content derived from revision 1.1
`• ATX12V content derived from revision 2.2
`• SFX12V content derived from revision 3.1
`• TFX12V content derived from revision 2.1
`— - Updated 12V1 current for 300 W configuration
`— - Updated efficiency loading for 300 W configuration
`• Updated Capacitive Load section to use standard capacitor values
`• Updated 5 VSB efficiency recommendations for Digital Office platforms
`• Removed power-down warning from power supply timing diagram
`• Marked sections with labels to indicate REQUIRED, RECOMMENDED, or OPTIONAL
`items
`
`• Added 12V2 Current for Processor Configurations table
`• Added revision numbers to form factor specific chapters
`• Changed Input Line Current Harmonic Content to OPTIONAL to better reflect
`geographical requirements
`
`• Removed outdated ENERGY STAR* requirements and added some new ENERGY
`STAR information.
`• Updated Typical Power Distribution tables for all power supply form factors and
`updated minimum loads.
`• Updated cross regulation figures.
`• Added Flex ATX power supply form factor.
`• Updated capacitive loading table.
`• Clarified over voltage and over current verbiage.
`• Added Power-up Cross Loading Condition section.
`• Other changes shown in red with change bars.
`
`January 2006
`
`June 2006
`
`March 2007
`
`0.5
`
`1.0
`
`1.1
`
`§
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`Introduction
`
`1
`
`Introduction
`
`This document provides design suggestions for various power supply form factors. The
`power supplies are primarily intended for use with desktop system designs. It should
`not be inferred that all power supplies must conform exactly to the content of this
`document, though there are key parameters that define mechanical fit across a
`common set of platforms. Since power supply needs vary depending on system
`configuration, the design specifics described are not intended to support all possible
`systems.
`
`1.1
`
`Reference Documentation
`
`The following documents are referenced in various sections of this design guide. For
`guidelines not specifically mentioned here, please reference the appropriate document.
`
`Document
`
`Document
`Number/Source or
`Password
`
`European A